Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
unintelligibly is an adverb meaning "in an unintelligible manner". It carries one recorded sense.
in an unintelligible manner
“the foreigners spoke unintelligibly”
Definitions, synonyms and semantic relations for unintelligibly come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.